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The problem with the 135 diff its a pile of shit
It has so many weak links your wasting your time upgrading if your
going to race
The pinion gear shaft is weak and breaks, the pinion gear bearing fails as
its a design flaw in the diff
The half shaft are weak and break.
Has limited gear ratios and the list goes on
The 1m/m3 diff is basically unbreakable as many races have found out.
You have an abundance of ratios to choose from
You can install any diff centre from an abundance of manufactures
It has super strong axels yet to be broken.
The diff is far superior and yet to be broken even at the drag strip on full slicks
The drive shaft to diff coupling is superior as the 135 ones fail easily and
is a common problem.
It has passive cooling unlike 135i
The whole cradle can be had for £1000 plus shipping from UK and that and
that comes with m3 arms, m3 bushes.
What a saving over these silly 135 diff upgrades, now if you want to upgrade
the m diff since you don't like it the plethora of upgrades is available to you
But for 99% of drivers this is the best way to upgrade the 135/335 diff and
get the traction they are lacking.
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